Malicious Office (OLE) / .XLSX — malware analysis report

Static analysis result for SHA-256 c902bba4be5e50df…

MALICIOUS

Office (OLE) / .XLSX

142.0 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: add0a31513983c9964d9db293852d1cb SHA-1: b92f0e2f523ff8b2e161db5af33507bf291cef3f SHA-256: c902bba4be5e50dff28c078f35f09b5ead7d630773a3ead2dec3220b5b627e5e
280 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The sample is a macro-enabled Excel file that contains a Workbook_Open macro. This macro utilizes Wscript.Shell and Scripting.FileSystemObject to create and execute a batch file named 'jledshf.bat' and a VBScript file named 'sduoixo.vbs' in the 'c:\programdata' directory. The VBScript appears to be obfuscated but attempts to download a payload from multiple URLs, including 'http://goyaluaat.vmeshaa.in/0v6kcnky/CG/7Ffk6LN2Yxs2W/'. The presence of Wscript.Shell and the execution of external scripts indicate a downloader or droppper functionality.

Heuristics 7

  • ClamAV: Doc.Malware.Valyria-10004384-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Valyria-10004384-0
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
527d0656a0c2c323955d068683ef8f7e20c035cda247a1e24383595c0eb3403b		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 7821 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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